期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 7, 页码 5219-5230出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00904
关键词
heterostructural electrode; built-in electric field; voltage window; high energy density; flexible supercapacitor
资金
- National Key Project of Fundamental Research of China [2012CB932304]
- National Natural Science Foundation of China [11474174, 11674185, 21763007]
- Hundred-Talent Program of the Guizhou Province [QKH-LT[2016]5675]
- Science Research Fund of Guizhou Province, China [[2017]7335]
Hybrid nanostructures have been extensively utilized for supercapacitors, because the hybrid approach offers opportunities to combine Faradaic and capacitive energy storage mechanisms into one material. However, the fabrication of hybrid nanostructures with controllable morphologies and electronic structure and an understanding of the synergetic effects mechanism between components remain a common and critical challenge for the use of hybrid nanostructures as electrodes for supercapacitors. Here, we develop a simple method for the fabrication of interconnected CoMn2O4 mesoporous nanosheets on three-dimensional reduced graphene oxide supported by nickel foam as the electrode for supercapacitors. Resulting from their different work functions, interface charge separation and built-in electric field are induced by the CoMn2O4/3DrGO heterostructure, thus modulating the charge transfer kinetics and the operation voltage. As a result, the CoMn2O4/3DrGO heterostructure exhibits increased operating voltage, specific capacitances, and cycling stability. As a proof-of-concept application, an all-solid-state flexible asymmetric supercapacitor with CoMn2O4/3DrGO as the positive electrode and 3DrGO electrode as the negative electrode is fabricated. The obtained all-solid-state flexible supercapacitor with an extended operating voltage window of 1.8 V achieves an exceptional energy density of 46.35 W h kg(-1), as well as excellent cyclability with 89.7% capacitance retention after 5000 cycles and good structural flexibility. This work provides a novel strategy for enhancing kinetic aspects and energy densities by controlling electronic properties of the hybrid nanostructures.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据